utils/wxMMedia2/lib/sndcpcm.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndcpcm.cpp
   3 // Purpose:
   4 // Date: 08/11/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifdef __GNUG__
   9 #pragma implementation "sndcpcm.cpp"
  10 #endif
  11
  12 #include <wx/wxprec.h>
  13 #include "sndbase.h"
  14 #include "sndpcm.h"
  15 #include "sndcpcm.h"
  16
  17 wxSoundStreamPcm::wxSoundStreamPcm(wxSoundStream& sndio)
  18  : wxSoundStreamCodec(sndio)
  19 {
  20   m_function_in = NULL;
  21   m_function_out = NULL;
  22 }
  23
  24 wxSoundStreamPcm::~wxSoundStreamPcm()
  25 {
  26 }
  27
  28
  29 #define SWAP_BYTES 0
  30 #include "converter.def"
  31 #undef SWAP_BYTES
  32
  33 #define SWAP_BYTES 1
  34 #include "converter.def"
  35 #undef SWAP_BYTES
  36
  37 wxSoundStreamPcm::ConverterType s_convert_16_to_8[] = {
  38   Convert_16to8_16_no,
  39   Convert_16to8_U2S_16_no,
  40   NULL,
  41   NULL,
  42   Convert_16to8_U2S_16_yes,
  43   Convert_16to8_16_yes,
  44 };
  45
  46 wxSoundStreamPcm::ConverterType s_convert_16[] = {
  47   NULL,
  48   Convert_U2S_16_no,
  49   Convert_U2S_SWAP_16_no,
  50   Convert_U2S_SWAP_16_yes,
  51   Convert_U2S_16_yes,
  52   Convert_SWAP_16_no
  53 };
  54
  55 wxSoundStreamPcm::ConverterType s_convert_8[] = {
  56   NULL,
  57   Convert_U2S_8,
  58   Convert_U2S_8,
  59   Convert_U2S_8,
  60   Convert_U2S_8,
  61   NULL
  62 };
  63
  64 #define CONVERTER 0
  65 #define CONVERTER_SIGN 1
  66 #define CONVERTER_SIGN_SWAP 2
  67 #define CONVERTER_SWAP_SIGN_SWAP 3
  68 #define CONVERTER_SWAP_SIGN 4
  69 #define CONVERTER_SWAP 5
  70
  71 wxSoundStream& wxSoundStreamPcm::Read(void *buffer, size_t len)
  72 {
  73   if (!m_function_in) {
  74     m_sndio->Read(buffer, len);
  75     m_lastcount = m_sndio->GetLastAccess();
  76     m_snderror = m_sndio->GetError();
  77     return *this;
  78   }
  79
  80   // TODO
  81   m_sndio->Read(buffer, len);
  82   m_lastcount = m_sndio->GetLastAccess();
  83   m_snderror = m_sndio->GetError();
  84   return *this;
  85 }
  86
  87 wxSoundStream& wxSoundStreamPcm::Write(const void *buffer, size_t len)
  88 {
  89   char *tmp_buf;
  90   size_t len2;
  91
  92   if (!m_function_out)
  93     return m_sndio->Write(buffer, len);
  94
  95   len2 = (m_16_to_8) ? len / 2 : len;
  96
  97   tmp_buf = new char[len2];
  98   m_function_out((const char *)buffer, tmp_buf, len);
  99   m_sndio->Write(tmp_buf, len);
 100   delete[] tmp_buf;
 101
 102   m_lastcount = (m_16_to_8) ?
 103                     (m_sndio->GetLastAccess() * 2) : m_sndio->GetLastAccess();
 104
 105   return *this;
 106 }
 107
 108 bool wxSoundStreamPcm::SetSoundFormat(const wxSoundFormatBase& format)
 109 {
 110   wxSoundFormatBase *new_format;
 111   wxSoundFormatPcm *pcm_format, *pcm_format2;
 112   ConverterType *current_table;
 113   int index;
 114   bool change_sign;
 115
 116   if (m_sndio->SetSoundFormat(format)) {
 117     m_function_out = NULL;
 118     m_function_in = NULL;
 119     return TRUE;
 120   }
 121   if (format.GetType() != wxSOUND_PCM) {
 122     m_snderror = wxSOUND_INVFRMT;
 123     return FALSE;
 124   }
 125   if (m_sndformat)
 126     delete m_sndformat;
 127
 128   new_format = m_sndio->GetSoundFormat().Clone();
 129   pcm_format = (wxSoundFormatPcm *)&format;
 130   pcm_format2 = (wxSoundFormatPcm *)new_format;
 131
 132   m_16_to_8 = FALSE;
 133   if (pcm_format->GetBPS() == 16 && pcm_format2->GetBPS() == 8) {
 134     m_16_to_8 = TRUE;
 135     current_table = s_convert_16_to_8;
 136   } else if (pcm_format->GetBPS() == 16)
 137     current_table = s_convert_16;
 138   else
 139     current_table = s_convert_8;
 140
 141   change_sign = (pcm_format2->Signed() != pcm_format->Signed());
 142
 143 #define MY_ORDER wxBYTE_ORDER
 144 #if wxBYTE_ORDER == wxLITTLE_ENDIAN
 145 #define OTHER_ORDER wxBIG_ENDIAN
 146 #else
 147 #define OTHER_ORDER wxLITTLE_ENDIAN
 148 #endif
 149
 150   if (pcm_format->GetOrder() == OTHER_ORDER &&
 151       pcm_format2->GetOrder() == OTHER_ORDER && change_sign)
 152     index = CONVERTER_SWAP_SIGN_SWAP;
 153
 154   else if (pcm_format->GetOrder() == OTHER_ORDER &&
 155            pcm_format2->GetOrder() == MY_ORDER && change_sign)
 156     index = CONVERTER_SWAP_SIGN;
 157
 158   else if (pcm_format->GetOrder() == MY_ORDER &&
 159            pcm_format->GetOrder() == OTHER_ORDER && change_sign)
 160     index = CONVERTER_SIGN_SWAP;
 161
 162   else if (!change_sign &&
 163            pcm_format->GetOrder() != pcm_format2->GetOrder())
 164     index = CONVERTER_SWAP;
 165
 166   else
 167     index = CONVERTER;
 168
 169   m_function_out = current_table[index];
 170 //  m_function_in = current_table[index+1];
 171
 172   m_sndio->SetSoundFormat(*new_format);
 173   m_sndformat = new_format;
 174   return TRUE;
 175 }